Latices from emulsified hydrocarbon rubber solutions by membrane

Details Latices from emulsified hydrocarbon rubber solutions by membrane Latices from emulsified hydrocarbon rubber solutions by membrane

1998-08-20

2000-06-13

Merriam, Andrew E. C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523332, 523340, 528502A, 210637, 210639, 210640, 210641, 210643, 210644, 210651, 210652, 210654, C08J 302

Patent

active

060750731

ABSTRACT:
Rubbery polymers in hydrocarbon solutions are emulsified in aqueous liquids and converted to latices by partitioning the emulsion through a membrane of selective permeability to the hydrocarbon solvent relative to both water and the polymer, thereby removing the hydrocarbon solvent from the emulsion. The foaming that is often associated with removing hydrocarbon solvent from aqueous emulsions by conventional means is thus avoided. Membrane partitioning mechanisms that are useful for this application include those involving both nonporous and microporous membranes, those passing the solvent both as a liquid and as a gas, those drawing off the permeate as both a liquid and a gas, and various combinations of these methods.

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